1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++98, c++03, c++11, c++14
10 // <optional>
11 
12 // constexpr optional(const optional<T>&& rhs);
13 //   If is_trivially_move_constructible_v<T> is true,
14 //    this constructor shall be a constexpr constructor.
15 
16 #include <optional>
17 #include <type_traits>
18 #include <cassert>
19 
20 #include "test_macros.h"
21 
22 struct S {
23     constexpr S()   : v_(0) {}
24     S(int v)        : v_(v) {}
25     constexpr S(const S  &rhs) : v_(rhs.v_) {} // not trivially moveable
26     constexpr S(const S &&rhs) : v_(rhs.v_) {} // not trivially moveable
27     int v_;
28     };
29 
30 
31 int main(int, char**)
32 {
33     static_assert (!std::is_trivially_move_constructible_v<S>, "" );
34     constexpr std::optional<S> o1;
35     constexpr std::optional<S> o2 = std::move(o1);  // not constexpr
36 
37   return 0;
38 }
39